Question: What is Nitrous oxide subject role and its effect"
Paraphrase: What is the role and effect of nitrous oxide?
SPARQL (Wikidata): SELECT ?ans_1 ?ans_2 WHERE { wd:Q905750 wdt:P2868 ?ans_1 . wd:Q905750 wdt:P1542 ?ans_2 }
Answer: Nitrous oxide exposure, inhalational anaesthetic, Nitrous oxide exposure, non-opioid analgesic, Nitrous oxide exposure, nitric oxide donors